Digital Electronics - Digital Arithmetic Operations and Circuits

Exercise :: Digital Arithmetic Operations and Circuits - General Questions

26. 

One way to make a four-bit adder perform subtraction is by:

A. inverting the output.
B. inverting the carry-in.
C. inverting the B inputs.
D. grounding the B inputs.

Answer: Option C

Explanation:

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27. 

What is the most important operation in binary-coded decimal (BCD) arithmetic?

A. addition
B. subtraction
C. multiplication
D. division

Answer: Option A

Explanation:

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28. 

The range of positive numbers when using an eight-bit two's-complement system is:

A. 0 to 64
B. 0 to 100
C. 0 to 127
D. 0 to 256

Answer: Option C

Explanation:

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29. 

What are the two types of basic adder circuits?

A. sum and carry
B. half-adder and full-adder
C. asynchronous and synchronous
D. one- and two's-complement

Answer: Option B

Explanation:

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30. 

The truth table for a full adder is shown below. What are the values of X, Y, and Z?

A. X = 0, Y = 1, Z = 1
B. X = 1, Y = 1, Z = 1
C. X = 1, Y = 0, Z = 1
D. X = 0, Y = 0, Z = 1

Answer: Option B

Explanation:

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